An antifouling coating, a method for preparing the same and use thereof

Abstract

The present application relates to the technical field of marine antifouling coating, in particular to an organic-inorganic composite antifouling coating, a preparation method and application thereof.The raw materials of the antifouling coating include A component and B component in a weight ratio of (7-9):1, wherein the A component includes the following raw materials in parts by weight: 50-75 parts of hydroxyl silicone resin, and 5-20 parts of antifouling agent; the B component includes the following raw materials in parts by weight: 10-30 parts of modified silicone resin, 20-80 parts of silica gel, and 1-10 parts of auxiliary agent; the hydroxyl silicone resin is a two-end hydroxyl silicone oil, and the hydroxyl content in the hydroxyl silicone resin is 0.025-3 wt%.The present application provides a low surface energy antifouling coating applied to marine vessels, and the coating has a uniform and staggered low surface energy surface and a hydrogel surface.The low surface energy antifouling coating has good film elasticity, low surface tension, good impact resistance, high scratch resistance, and a long effective service life of more than seven years.

Description

Technical Field

[0001] This invention relates to the field of marine antifouling coating technology, specifically to an organic-inorganic composite antifouling coating, its preparation method, and its application. Background Technology

[0002] Antifouling coatings suitable for all types of ships, including steel and aluminum vessels, in marine environments should be free of organotin compounds and must be environmentally friendly, non-toxic, odorless, and have a long-lasting antifouling effect.

[0003] Current marine antifouling coatings mainly employ solvent-based antifouling coatings, self-polishing antifouling coatings, and low surface energy antifouling coatings. Solvent-based antifouling coatings are primarily composed of rosin, resin (chlorinated rubber), antifouling agent, additives, pigments, and solvents. Due to the initial dissolution of rosin and the release of the antifouling agent, solvent-based antifouling coatings offer good antifouling performance, typically lasting about one year. They are mainly used on fishing vessels. Self-polishing antifouling coatings are primarily composed of rosin, self-polishing resin (acrylic resin, silicone resin), antifouling agent, additives, pigments, and solvents. Self-polishing antifouling coatings are currently the mainstream antifouling product. Mature products exhibit stable antifouling agent release and good antifouling performance, generally lasting 3-5 years. Most commercial vessels currently use self-polishing antifouling coatings. However, the polishing process of self-polishing antifouling coatings relies heavily on the vessel's speed; therefore, different self-polishing antifouling coatings must be selected based on the vessel's speed. Low surface energy antifouling paint is a new generation of environmentally friendly antifouling paint. International brands like Hempel X3 contain no antifouling agents and rely primarily on the ultra-low surface tension of the coating surface, making it difficult for marine organisms to adhere and prevent fouling. However, in practical applications, long-lasting antifouling is difficult to achieve, and the antifouling period is relatively short (3-5 years).

[0004] Patent CN118064055A discloses a water-based organosilicon corrosion-resistant and antifouling transparent coating for marine environments, its preparation method, and its application. This invention uses water-based epoxy-modified organosilicon resin, a silane coupling agent as a curing agent, and carboxylated graphene oxide as an antibacterial agent to create an antifouling coating. However, this coating has limited effectiveness in preventing marine organism adhesion, and the carboxylated graphene oxide is not very effective at inhibiting marine organism growth. Furthermore, its lifespan is relatively short, failing to provide effective antifouling protection after only 2-3 years. Summary of the Invention

[0005] The purpose of this invention is to provide an effective antifouling coating with a long antifouling period, its preparation method, and its application.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] An antifouling coating, the raw materials of which include component A and component B in a weight ratio of (7-9):1, wherein component A includes the following raw materials in parts by weight: 50-75 parts of hydroxyl silicone resin and 5-20 parts of antifouling agent.

[0008] Component B comprises the following raw materials in parts by weight: 10-30 parts modified silicone resin, 20-80 parts silicone gel, and 1-10 parts additives;

[0009] Hydroxyl silicone resin is a two-hydroxyl-terminated silicone oil, and the hydroxyl content in the hydroxyl silicone resin is 0.025-3wt%.

[0010] If the hydroxyl value is too high, the molecular weight will be too low, and the paint film will be brittle; if the hydroxyl value is too low, the molecular weight will be too high, the viscosity will be too high, and the flowability will be poor.

[0011] In one preferred embodiment, the raw materials for the silicone gel in component B include 20-60 parts of silane, 0.2-10 parts of acid solution, and 30-70 parts of solvent.

[0012] In one preferred embodiment, the silane is tetraethyl orthosilicate.

[0013] In one preferred embodiment, the acid solution is at least one of hydrochloric acid, sulfuric acid, phosphoric acid, acetic acid, formic acid, and benzoic acid, preferably at least one of hydrochloric acid solution, sulfuric acid solution, and acetic acid solution.

[0014] In one preferred embodiment, the solvent is one of ethanol and methanol.

[0015] In one preferred embodiment, the preparation method of the silica gel in component B includes: dissolving silane in a solvent, adding an acid solution dropwise, and stirring the reaction for 13-30 hours.

[0016] In one preferred embodiment, the mass concentration of the acid solution is 30-37%.

[0017] In one preferred embodiment, component A further includes: 2-20 parts of pigment, 0-10 parts of filler, and 5-30 parts of solvent.

[0018] In one preferred embodiment, component B further includes 10-40 parts of solvent.

[0019] In one preferred embodiment, the viscosity of the hydroxyl silicone resin is 50-5000 Pa·s.

[0020] Excessive viscosity and molecular weight significantly affect workability and leveling; conversely, excessively small molecular weight is also detrimental to product application.

[0021] In one preferred embodiment, the antifouling agent in component A is at least one of cuprous oxide, copper pyrithione, and DCOIT.

[0022] In one preferred embodiment, the pigment in component A is at least one selected from iron oxide red, titanium dioxide, iron oxide yellow, cobalt blue, cobalt green, titanium nickel yellow, carbon black, copper chromium black, iron black, phthalocyanine blue, phthalocyanine green, and scarlet pigment.

[0023] In one preferred embodiment, the filler in component A is at least one of silica, feldspar powder, talc powder, barium sulfate, and fumed silica, preferably at least one of silica and barium sulfate.

[0024] In one preferred embodiment, the solvent in component A is at least one selected from xylene, ethanol, acetylacetone, n-butanol, and isobutanol.

[0025] In one preferred embodiment, the modified silicone resin in component B is at least one selected from epoxy polyether modified silicone resin, polyethylene glycol modified silicone resin, polyetheramine modified silicone resin, and polyether modified silicone resin. Preferably, it is a polyether modified silicone resin or a polyether modified hydrogen-containing silicone resin.

[0026] In one preferred embodiment, the auxiliary agent in component B is at least one of organotin, organotin chelate, titanate, titanium chelate, iron acetylacetonate, and aluminum acetylacetonate, preferably at least one of organotin, organotin chelate, iron acetylacetonate, and aluminum acetylacetonate.

[0027] In one preferred embodiment, the solvent in component B is at least one of xylene, toluene, trimethylbenzene, ethanol, propylene glycol methyl ether, n-butanol, isobutanol, acetylacetone, and butanone oxime, preferably at least one of xylene, acetylacetone, and butanone oxime.

[0028] Based on the same inventive concept, the present invention also claims protection for a method for preparing the antifouling coating, comprising the following steps:

[0029] Preparation of component A: First, stir the hydroxyl silicone resin and part of the solvent evenly. Then, under stirring, add the pigment, antifouling agent and filler, and disperse for 20-30 minutes to obtain a slurry. Then, grind the slurry to a fineness of ≤20μm and add the remaining solvent.

[0030] Preparation of component B: The inorganic gel, solvent and additives are stirred evenly, and then the modified organosilicon resin is added under stirring conditions;

[0031] Mix component A and component B evenly according to the specified ratio to obtain the antifouling coating.

[0032] In one preferred embodiment, the stirring speed is 400-800 rpm / min.

[0033] A third objective of this invention is to provide the application of the aforementioned antifouling coating in antifouling applications on the bottom of ships. Specifically, it involves spraying the coating onto the bottom of ships to enhance their antifouling and antimicrobial adhesion properties.

[0034] The purpose of this invention is to provide a low surface energy antifouling coating for marine vessels. The coating has uniformly interwoven low surface energy surfaces and hydrogel surfaces. The hydrogel coating has properties similar to those of contact lenses. The film has a smooth appearance, but microscopically, it has many small areas of hydrophilic film layers. Water vapor can slowly permeate and escape from these hydrophilic film layers. This low surface energy antifouling coating film has good elasticity, low surface tension, good impact resistance, and high scratch resistance.

[0035] Specifically, the technical solution of this invention employs a combination of low surface tension coating as the primary method, and hydrogel technology and bactericides as secondary methods to jointly address the problem of short antifouling period of low surface energy antifouling paint. The invention will now be further explained:

[0036] The antifouling coating of this invention is composed of ultra-low surface energy hydroxyl silicone resin, oligomeric inorganic silica gel, and hydrophilic polyether segments. The low surface energy hydroxyl silicone resin and the ultra-low surface tension oligomeric inorganic silica gel undergo a condensation reaction to form a three-dimensional seaweed structure, providing an ultra-low surface energy hydrophobic portion of the coating. The polyether segment-modified silicone resin is uniformly embedded in the pores of the three-dimensional seaweed structure, providing a hydrophilic surface. In seawater, the polyether segments slowly dissolve, while the silicone portion combines with water to form a hydrogel. Due to the mixing of the coating during application, these components become a uniform three-dimensional dispersion. After film formation and drying, it forms a uniform coating. Microscopically, the hydrophobic inorganic silica gel structure and the polyether silicone structure segments are uniformly interwoven, thus forming a coating film in seawater with an ultra-low surface energy structure as the main component and hydrophilic structures interspersed within, creating a silicone elastomer similar to contact lenses. After application, the hydrophilic polyether segments absorb water to form a microporous hydrogel layer. This microporous hydrogel layer undergoes extremely slow mass exchange; the inflow and outflow of water carries away the antifouling agent and polyether silicone. The polyether silicone and antifouling agent further combine to form a hydrogel surface. A new hydrogel film containing antifouling agent is formed on the hydrophilic surface. This hydrophilic hydrogel film not only contains a high concentration of antifouling agent, but also prevents bacterial growth and fouling, thus disrupting the marine organism growth environment and preventing marine organisms from forming on the coating surface. Over time, this also prevents marine organisms from attaching to the hydrophobic, low-surface-energy portions of the coating. Furthermore, due to the low surface tension of the coating, marine organisms are less likely to adhere to the hydrophobic portions. Due to its low surface energy design, the main body of this coating is an ultra-low surface tension silicone coating. The superhydrophobic structure of the matrix resin accounts for more than 95% of the coating structure, so the coating exhibits ultra-low surface tension and extremely strong hydrophobic properties. Theoretically, the water contact angle of a pure inorganic silicone coating can reach more than 150°. The hydrophilic part will reduce the water contact angle. According to actual measurements, the antifouling coating of this invention has a water contact angle of more than 110°. The coating as a whole exhibits excellent marine organism desorption ability and has an effective service life of more than seven years. It effectively reduces the resistance of ships during navigation for a long time, thereby reducing energy consumption and increasing speed, and can reduce energy consumption by more than 10%. Detailed Implementation

[0037] The technical solution of the present invention will be further described below with reference to specific embodiments. In the following embodiments, the antifouling coating prepared by the present invention is applied to the coating of ships.

[0038] Example 1

[0039] Preparation of antifouling coatings:

[0040] Preparation of Component A: 6.3 kg of hydroxyl silicone resin (Dow Corning 4010, with a hydroxyl content of 0.025-0.03 wt%) was added to a dispersing mixer. 1.4 kg of xylene was added at 500 rpm and mixed evenly. Then, 0.9 kg of pyridine thione and 0.9 kg of iron oxide red were added and stirred at high speed for 25 minutes. The mixture was then milled to a fineness of ≤25 μm, and 0.5 kg of xylene was added. The mixture was then discharged for later use.

[0041] Preparation of component B:

[0042] (1) Preparation of homemade oligomeric inorganic silica gel solution:

[0043] 1) Preparation of acid solution: Add 97.3 kg of 37% hydrochloric acid and 2.7 kg of water to the solvent, stir well and set aside.

[0044] 2) Preparation of oligomeric inorganic silica gel solution: Add 6 kg of ethanol and 5.6 kg of tetraethyl orthosilicate to a container, stir to 500 rpm, and add 0.4 kg of hydrochloric acid solution while stirring. Seal and let stand for 24 hours for later use.

[0045] Preparation of component B: Add 5 kg of oligomeric inorganic silica gel solution to a container, add 1.8 kg of xylene, 1 kg of 10% dibutyltin laurate, and 2.2 kg of Dow Corning DC57, and mix well.

[0046] Mix component A and component B evenly at a weight ratio of 8:1 to obtain an antifouling coating.

[0047] The application method for antifouling coatings is as follows:

[0048] After degreasing the sandblasted steel plate, apply 220μm of general-purpose epoxy primer and 100μm of silicone antifouling paint binder. Thoroughly mix components A and B at an 8:1 ratio (by mass). Spray the mixture onto the silicone antifouling paint binder. The dry film thickness is 200μm, and the wet film thickness is 285μm. The application rate is 0.3kg / m². 2 Curing at room temperature for 24 hours forms an anti-fouling coating.

[0049] Example 2

[0050] Preparation of antifouling paint:

[0051] Preparation of Component A: Add 5 kg of hydroxyl silicone resin (Dow Corning 4010, with a hydroxyl content of 0.025-0.03 wt%) to a dispersing mixer, add 2.0 kg of acetylacetone at 500 rpm, mix evenly, then add 1.5 kg of pyridine thione, 0.8 kg of iron oxide red, and 0.2 kg of silica and stir at high speed for 25 minutes; then grind to a fineness ≤25 μm, add 0.5 kg of acetylacetone, and discharge for later use.

[0052] Preparation of component B:

[0053] (1) Preparation of homemade oligomeric inorganic silica gel solution:

[0054] 1) Preparation of acid solution: Add 98 kg of 37% hydrochloric acid and 2 kg of water to the solvent, stir well and set aside.

[0055] 2) Preparation of oligomeric inorganic silica gel solution: Add 6 kg of ethanol and 5.0 kg of tetraethyl orthosilicate to a container, stir to 500 rpm, and add 0.3 kg of hydrochloric acid solution while stirring. Seal and let stand for 24 hours for later use.

[0056] Preparation of component B1: Add 5 kg of oligomeric inorganic silica gel solution to a container, add 1.2 kg of xylene, 2 kg of 10% dibutyltin laurate, and 1.8 kg of Dow Corning DC57, and mix well.

[0057] The application method of the antifouling coating in this embodiment is the same as the application method described in Embodiment 1.

[0058] Example 3

[0059] Preparation of antifouling paint:

[0060] Preparation of Component A: 7.5 kg of hydroxyl silicone resin (Dow Corning 0156, with a hydroxyl content of 2.5-3 wt%) was added to a dispersing mixer. 0.7 kg of ethanol was added at 500 rpm and mixed evenly. Then, 0.8 kg of pyridine thione and 0.5 kg of iron oxide red were added and stirred at high speed for 25 minutes. The mixture was then milled to a fineness of ≤25 μm, and 0.5 ethanol was added. The mixture was then discharged for later use.

[0061] Preparation of component B:

[0062] (1) Preparation of homemade oligomeric inorganic silica gel solution:

[0063] 1) Preparation of acid solution: Add 96.4 kg of 37% hydrochloric acid and 3.6 kg of water to the solvent, stir well and set aside.

[0064] 2) Preparation of oligomeric inorganic silica gel solution: Add 6 kg of ethanol and 5.6 kg of tetraethyl orthosilicate to a container, stir to 500 rpm, and add 0.4 kg of hydrochloric acid solution while stirring. Seal and let stand for 24 hours for later use.

[0065] Preparation of component B: Add 6 kg of oligomeric inorganic silica gel solution to a container, add 1 kg of xylene, 1.5 kg of 10% dibutyltin laurate, and 1.5 kg of Dow Corning DC57, and mix well.

[0066] The application method of the antifouling coating in this embodiment is the same as the application method described in Embodiment 1.

[0067] Example 4

[0068] Preparation of antifouling paint:

[0069] Preparation of Component A: 6 kg of hydroxyl silicone resin (Dow Corning 0156, with a hydroxyl content of 2.5-3 wt%) was added to a dispersing mixer. 1.2 kg of n-butanol was added at 500 rpm and mixed evenly. Then, 1.2 kg of pyridine thione and 1.1 kg of iron oxide red were added and stirred at high speed for 25 minutes. The mixture was then milled to a fineness of ≤25 μm, and 0.5 n-butanol was added. The mixture was then discharged for later use.

[0070] Preparation of component B:

[0071] (1) Preparation of homemade oligomeric inorganic silica gel solution:

[0072] 1) Preparation of acid solution: Add 99 kg of 37% hydrochloric acid and 1 kg of water to the solvent, stir well and set aside.

[0073] 2) Preparation of oligomeric inorganic silica gel solution: Add 6 kg of ethanol and 5.6 kg of tetraethyl orthosilicate to a container, stir to 500 rpm, and add 0.5 kg of hydrochloric acid solution while stirring. Seal and let stand for 24 hours for later use.

[0074] Preparation of component B: Add 5.5 kg of oligomeric inorganic silica gel solution to a container, add 0.5 kg of xylene, 2 kg of 10% dibutyltin laurate, and 2 kg of Dow Corning DC57, and mix well.

[0075] The antifouling coating application method in this embodiment is the same as the application method described in Embodiment 1.

[0076] Comparative Example 1

[0077] The difference between this comparative example and Example 1 is that this comparative example does not add oligomeric inorganic silica gel solution, but instead adds an equal amount of tetraethyl orthosilicate.

[0078] Preparation of antifouling paint:

[0079] Preparation of Component A: 6.3 kg of hydroxyl silicone resin (Dow Corning 4010, with a hydroxyl content of 0.025-0.03 wt%) was added to a dispersing mixer. 1.4 kg of xylene was added at 500 rpm and mixed evenly. Then, 0.9 kg of pyridine thione and 0.9 kg of iron oxide red were added and stirred at high speed for 25 minutes. The mixture was then milled to a fineness of ≤25 μm, and 0.5 kg of xylene was added. The mixture was then discharged for later use.

[0080] Preparation of component B:

[0081] Take 6.4 kg of ethanol and 5.6 kg of tetraethyl orthosilicate and mix them evenly to obtain a tetraethyl orthosilicate solution.

[0082] Preparation of component B: Add 5 kg of tetraethyl orthosilicate solution to a container, add 1.8 kg of xylene, 1 kg of 10% dibutyltin laurate, and 2.2 kg of Dow Corning DC57, and mix well.

[0083] The application method of the antifouling coating in this comparative example is the same as the application method described in Example 1.

[0084] Comparative Example 2

[0085] The difference between this comparative example and Example 1 is that this comparative example does not add hydroxyl silicone resin, but instead adds an equal amount of methyl silicone resin.

[0086] Preparation of Component A: Add 6.3 kg of methyl silicone resin (Dow Corning PMX200) to a dispersing mixer, add 1.4 kg of xylene at 500 rpm, mix evenly, add 0.9 kg of pyridine thione and 0.9 kg of iron oxide red, and stir at high speed for 25 minutes; then grind to a fineness ≤25 μm, add 0.5 kg of xylene, and discharge for later use.

[0087] Preparation of component B:

[0088] (1) Preparation of homemade oligomeric inorganic silica gel solution:

[0089] 1) Preparation of acid solution: Add 97.3 kg of 37% hydrochloric acid and 2.7 kg of water to the solvent, stir well and set aside.

[0090] 2) Preparation of oligomeric inorganic silica gel solution: Add 6 kg of ethanol and 5.6 kg of tetraethyl orthosilicate to a container, stir to 500 rpm, and add 0.4 kg of hydrochloric acid solution while stirring. Seal and let stand for 24 hours for later use.

[0091] Preparation of component B: Add 5 kg of oligomeric inorganic silica gel solution to a container, add 1.8 kg of xylene, 1 kg of 10% dibutyltin laurate, and 2.2 kg of Dow Corning DC57, and mix well.

[0092] The application method of the antifouling coating in this comparative example is the same as the application method described in Example 1.

[0093] Comparative Example 3

[0094] The difference between this comparative example and Example 1 is that this comparative example does not add modified silicone resin, but instead adds an equal amount of silicone resin KH550.

[0095] Preparation of antifouling paint:

[0096] Preparation of Component A: 6.3 kg of hydroxyl silicone resin (Dow Corning 4010, with a hydroxyl content of 0.025-0.03 wt%) was added to a dispersing mixer. 1.4 kg of xylene was added at 500 rpm and mixed evenly. Then, 0.9 kg of pyridine thione and 0.9 kg of iron oxide red were added and stirred at high speed for 25 minutes. The mixture was then milled to a fineness of ≤25 μm, and 0.5 kg of xylene was added. The mixture was then discharged for later use.

[0097] Preparation of component B:

[0098] (1) Preparation of homemade oligomeric inorganic silica gel solution:

[0099] 1) Preparation of acid solution: Add 97.3 kg of 37% hydrochloric acid and 2.7 kg of water to the solvent, stir well and set aside.

[0100] 2) Preparation of oligomeric inorganic silica gel solution: Add 6 kg of ethanol and 5.6 kg of tetraethyl orthosilicate to a container, stir to 500 rpm, and add 0.4 kg of hydrochloric acid solution while stirring. Seal and let stand for 24 hours for later use.

[0101] Preparation of component B: Add 5 kg of oligomeric inorganic silica gel solution to a container, add 1.8 kg of xylene, 1 kg of 10% dibutyltin laurate, and 2.2 kg of KH550, and mix thoroughly.

[0102] The application method of the antifouling coating in this comparative example is the same as the application method described in Example 1.

[0103] Comparative Example 4

[0104] The difference between this comparative example and Example 1 is that no hydroxyl silicone resin is added to this comparative example.

[0105] Preparation of antifouling paint:

[0106] Preparation of component A: Add 1.4 kg xylene to a dispersing mixer, add 0.9 kg pyridinethione and 0.9 kg iron oxide red at 500 rpm, and stir at high speed for 25 minutes; then grind to a fineness ≤25 μm, add 0.5 kg xylene, and discharge for later use.

[0107] Preparation of component B:

[0108] (1) Preparation of homemade oligomeric inorganic silica gel solution:

[0109] 1) Preparation of acid solution: Add 97.3 kg of 37% hydrochloric acid and 2.7 kg of water to the solvent, stir well and set aside.

[0110] 2) Preparation of oligomeric inorganic silica gel solution: Add 6 kg of ethanol and 5.6 kg of tetraethyl orthosilicate to a container, stir to 500 rpm, and add 0.4 kg of hydrochloric acid solution while stirring. Seal and let stand for 24 hours for later use.

[0111] Preparation of component B: Add 5 kg of oligomeric inorganic silica gel solution to a container, add 1.8 kg of xylene, 1 kg of 10% dibutyltin laurate, and 2.2 kg of Dow Corning DC57, and mix well.

[0112] The application method of the antifouling coating in this comparative example is basically the same as the application method described in Example 1.

[0113] Comparative Example 5

[0114] The difference between this comparative example and Example 1 is that no oligomeric inorganic silica gel solution is added to this comparative example.

[0115] Preparation of Component A: 6.3 kg of hydroxyl silicone resin (Dow Corning 4010, with a hydroxyl content of 0.025-0.03 wt%) was added to a dispersing mixer. 1.4 kg of xylene was added at 500 rpm and mixed evenly. Then, 0.9 kg of pyridine thione and 0.9 kg of iron oxide red were added and stirred at high speed for 25 minutes. The mixture was then milled to a fineness of ≤25 μm, and 0.5 kg of xylene was added. The mixture was then discharged for later use.

[0116] Preparation of component B:

[0117] Preparation of component B: Add 1.8 kg xylene to a container, add 1 kg 10% dibutyltin laurate and 2.2 kg Dow Corning DC57, and mix well.

[0118] The antifouling coatings prepared in Examples 1-4 and Comparative Examples 1-5 were subjected to performance tests, and compared with commercially available low surface energy coatings. The commercially available low surface energy antifouling coatings were used according to the method described in Example 1. Specific performance test data are shown in Table 1.

[0119] Table 1 Performance Indicators of Antifouling Coating

[0120]

[0121]

[0122] Some of the comparative examples cannot be solidified, such as comparative example 5.

[0123] As shown in Table 1, the antifouling performance decreases when using non-oligomeric inorganic silicone gel curing agents; other types of silicone resins exhibit very poor performance; and non-polyether organosilicon-based antifouling performance decreases significantly. These comparisons demonstrate that the coating combining ultra-low surface energy, hydrophilic hydrogel, and antifouling agent exhibits excellent antifouling performance, indicating that the improvements of this invention contribute to enhancing antifouling performance. The antifouling coating prepared by the method of this invention has a higher solids content and lower VOCs compared to commercially available similar products. Dynamic simulation tests show superior performance compared to commercially available products, with over 8 cycles of dynamic simulation testing and an effective service life of over 7 years, fully meeting the requirements for marine antifouling coatings.

[0124] The above embodiments are for further illustrating the technical content of the present invention, but do not mean that the embodiments of the present invention are limited to these. Any modifications or technical extensions made based on the present invention without departing from the principle of the present invention shall be considered within the scope of protection of the present invention.

Claims

1. An antifouling coating, characterized in that, Its raw materials include component A and component B in a weight ratio of (7-9): 1, wherein component A includes the following raw materials in parts by weight: 50-75 parts of hydroxyl silicone resin and 5-20 parts of antifouling agent; Component B comprises the following raw materials in parts by weight: 10-30 parts modified silicone resin, 20-80 parts silicone gel, and 1-10 parts additives; Hydroxyl-terminated silicone resin is a two-hydroxyl-terminated silicone oil, and the hydroxyl content in the hydroxyl-terminated silicone resin is 0.025-3 wt%. In component B, the raw materials for the silicone gel include 20-60 parts of silane, 0.2-10 parts of acid solution, and 30-70 parts of solvent; The silane is tetraethyl orthosilicate; the acid solution is at least one of hydrochloric acid, sulfuric acid, phosphoric acid, acetic acid, formic acid, and benzoic acid; the mass concentration of the acid solution is 30-37%; the solvent is one of ethanol and methanol. The preparation method of the silica gel in component B includes: dissolving silane in a solvent, adding acid solution dropwise, and stirring the reaction for 13-30 hours to obtain the product; In component B, the modified silicone resin is at least one of epoxy polyether modified silicone resin, polyethylene glycol modified silicone resin, and polyetheramine modified silicone resin.

2. The antifouling coating according to claim 1, characterized in that, Component A also includes: 2-20 parts of pigment, 0-10 parts of filler and 5-30 parts of solvent; Component B also includes: 10-40 parts of solvent.

3. The antifouling coating according to claim 2, characterized in that, The viscosity of hydroxyl-containing silicone resin is 50-5000 Pa. . s.

4. The antifouling coating according to claim 2, characterized in that, In component A, the antifouling agent is at least one of cuprous oxide, copper pyrithione, and DCOIT; the pigment is at least one of iron oxide red, titanium dioxide, iron oxide yellow, cobalt blue, cobalt green, titanium nickel yellow, carbon black, copper chromate black, iron black, phthalocyanine blue, phthalocyanine green, and scarlet pigment; the filler is at least one of silica, feldspar powder, talc, barium sulfate, and fumed silica; and the solvent is at least one of xylene, ethanol, acetylacetone, n-butanol, and isobutanol.

5. The antifouling coating according to claim 2, characterized in that, In component A, the filler is at least one of silicon dioxide and barium sulfate.

6. The antifouling coating according to claim 2, characterized in that, The additive is at least one of organotin, titanate, titanium chelate, iron acetylacetone, and aluminum acetylacetone; the solvent is at least one of xylene, toluene, trimethylbenzene, ethanol, propylene glycol methyl ether, n-butanol, isobutanol, acetylacetone, and butanone oxime.

7. The method for preparing the antifouling coating according to any one of claims 2-6, characterized in that, Includes the following steps: Preparation of component A: First, stir the hydroxyl silicone resin and part of the solvent evenly, then add the pigment, antifouling agent and filler under stirring, and disperse for 20-30 minutes to obtain the slurry; Then, grind the slurry to a fineness of ≤20μm and add the remaining solvent; Preparation of component B: The silicone gel, solvent and additives are stirred evenly, and then the modified organosilicon resin is added under stirring conditions; Mix component A and component B evenly according to the specified ratio to obtain the antifouling coating.

8. The application of the antifouling coating according to any one of claims 1-6 to antifouling of the bottom of a ship.

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